@ Bagus Aditya:
For the security of your trading and funds, we recommend choosing a broker that is already regulated by a credible international regulatory body, namely: CFTC, NFA, FCA, FSA, FINMA, MiFID, ASIC and FMA.
A credible regulatory body is one that has been tested and internationally recognized, and imposes strict sanctions on brokers if they are found to have violated agreed-upon terms. The regulatory body is also responsible for the security of client funds.
So please check the regulations of the brokers you mentioned above.
Regarding whether the server is active on Saturdays and Sundays, as far as we know, if the broker offers cryptocurrency products such as Bitcoin etc., then the server for cryptocurrencies remains active, but for forex and others (other than crypto) the market is closed on Saturdays and Sundays, so the price does not move.
To find out the trading time for a pair, please see the contract specifications for the pair. If using the Metatrader platform, you can right-click on the pair in Market Watch, then view Specification.